The GPS Explorer data portal uses new web technologies for the discovery of GPS data and data products, with a focus on the western North America region covered by the JPL/SOPAC REASoN and Plate Boundary Observatory projects. It also provides the scientific community with on-the-fly modeling tools for GPS analysis.

Status: 06/20/2008: The REASoN combination, SOPAC GLOBK and JPL GIPSY time series have been updated and are now in the ITRF2005 reference frame. The first two of these coordinate sets start with year 2000; we are currently working on data prior to 2000.

Features: Users can easily navigate the portal using its dashboard and portlet-based design, and may save site groups and model results for subsequent logins. When navigating maps via the Scripps Online Mapping Interface (SOMI), the resulting map state (layers, highlighted sites, etc). is retained throughout the portal.

• GPS sites of interest may be selected via SOMI portlets, spatial mapping filters and GPS equipment restrictions.
• sites can be saved to a group, and used for data retrieval or modeling jobs
• modeling tools currently include RDAHMM and a QOCA-based (st_filter) utility.

Web technologies: the portal uses the Gridsphere portal framework, web 2.0 technologies such as AJAX, and back-end SOAP-based web service clients for obtaining data. This results in a powerful, sophisticated graphical user interface for data exploration.

Future applications and improvements include:

• new modeling tools - network-mode QOCA analysis applications for regional filtering and time series generation. QuakeSim applications such as disloc and simplex will also be included.
• integration of modeling results into the SOMI map portlets, e.g., strain map plotting, velocity vectors for user-defined reference frames and time periods
• allow users to transform data (via QOCA-based tools); e.g., polar rotation, cartesian <-> geodetic alternative time series plotting tools:
• use web 2.0 technologies for plotting of user-defined spatial and temporal GPS time series, and analyze_tseri results real time GPS site status/product integration
• improved browser compatibility; address functionality issues with gridsphere portlet buttons

Feedback: As GPS Explorer matures from a beta product to an official release, we seek input from the user community through forums designed for reporting feature requests and bugs. Registration is required; for help, contact webmaster-at-sopac.ucsd.edu.